A U3964 abend indicates there was a program check in either the master task or the DBRC task. The IEC130I error messages are caused by the WTOEXIT trying to open the files it needs. Failure to open these files causes a program check in the WTOEXIT. Since the WTOEXIT is running under a system task, CA IDMS will abend with a U3964. The solution is to add the missing DD statements (in the example above this would be JESRDR and PLOGJOB) to the CA IDMS CV JCL and restart the CV.